A windows 8 user has to get familiar with closing metro style apps, as you don’t get any conventional cross/maximize/minimize buttons. To close a metro style app, you have to drag it with your mouse from top towards bottom. This distance needed to be dragged from top edge to bottom can be changed and set it as per your own convenience.
By default you have to drag the app to the bottom edge of the screen to close it but this can be improved with the following registry edit. To do this follow these steps:
Step 1: Open registry editor by pressing Windows key + R and type regedit
Step 2: Browse to the following location:
Note that if you are not able to find the above mentioned key, simply create it yourself in the exactly described path.
Step 3: There create a new DWORD VALUE by right clicking in the right pane and name it MouseCloseThreshold.
The value of this DWORD ranges from 1 to 1000 in Decimal. Greater the value is, lesser you have to drag to close the metro app.
So to change the value, right clik on the DWORD and choose, EDIT and change type from Hexadecimal to Decimal.
You can play around with the values to select which one is suitable for you to close modern metro apps.
If you set this value to ZERO, you will not be able to drag i.e. you will not be able to close these apps by mouse. Then you have to use the app switcher by moving your mouse to the top left corner, right click on the application and then close.